Quarterly report pursuant to Section 13 or 15(d)

Acquisitions (Details)

v3.8.0.1
Acquisitions (Details)
$ in Thousands, € in Millions, £ in Millions
3 Months Ended
Nov. 28, 2017
USD ($)
Mar. 01, 2017
USD ($)
Mar. 01, 2017
GBP (£)
Feb. 28, 2017
USD ($)
Jan. 13, 2017
USD ($)
Jan. 13, 2017
GBP (£)
Jan. 03, 2017
USD ($)
Jan. 03, 2017
EUR (€)
Nov. 30, 2016
USD ($)
Nov. 30, 2016
GBP (£)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Business Acquisition [Line Items]                        
Acquisition price                     $ 85,964 $ 10,733
Compass Engineering Group, Inc                        
Business Acquisition [Line Items]                        
Acquisition price $ 49,793                      
Additional Acquisitions                        
Business Acquisition [Line Items]                        
Acquisition price                     $ 36,171  
GJ Creative Limited                        
Business Acquisition [Line Items]                        
Acquisition price   $ 37,596 £ 30.5                  
RAF Technology, Inc.                        
Business Acquisition [Line Items]                        
Acquisition price       $ 8,717                
VCG (Holdings) Limited                        
Business Acquisition [Line Items]                        
Acquisition price         $ 10,695 £ 8.8            
Ungricht                        
Business Acquisition [Line Items]                        
Acquisition price             $ 25,185 € 24.0        
Guidance Automation Limited                        
Business Acquisition [Line Items]                        
Acquisition price                 $ 9,974 £ 8.0